The latest version of FastCube VCL supports Embarcadero RAD Studio XE8 (Delphi XE8/C++Builder XE8).
And not only that:
+ Added sorting in CubeGrid and DetailGrid 
+ Added TfcxSlice.ApplyDefaultSettings 
+ Added TfcxSlice.ResetDisplayLabelOfFields 
+ Added aggregate function Weighted arithmetic mean 
+ Detail grid does not reset the list of fields on each show 
+ Added aggregate function Median 
+ Added option "Merge Cells" in export to Excel 
* Acceleration and optimization calculation of measures 
* Hide "Sort" menu item for "Measures" field since it has no sense for it 
* Renamed property TfcxMeasureField.SliceField2 to TfcxMeasureField.SliceFieldDistinct 
* Removed filters for number input in the Range editor 
- Fixed errors of calculation of totals which based on other totals 
- Fixed errors of measures calculation 
- Fixed error of loading filters with NULL value 
- Disabled DoubleBuffered, ParentDoubleBuffered for XE6+ since it cause painting glitches 
- Fixed error with attributes referenced from main dataset 
- Fixed error in TfcxMeasuresContainer.SetPosition 
- Fixed error in HideZero 
- Fixed memory allocation error in xls Export on 64bit platforms 
- Fixed error in TfcxAxisContainer.DimValue 
- Fixed error in CopyToClipboard from DetailGrid 
- Fixed error with determining of Minimal Value for conditional highlight in some situations